Earlier quoted context omitted.
There may well be flights. Crew are exempt, so at least for slot-controlled airports it's probably worth flying anyway to keep the slot; you'll have some US citizens / permanent residents and their families, and you can fill the belly with cargo since you have spare weight. Might be worth it even for airports that aren't slot-controlled.
Various aviation authorities in Europe are relaxing the requirements that is driving the slot controls & ghost flights. Don't have the link now but read it earlier.
https://www.theguardian.com/business/2020/mar/10/eu-airlines...